KABUL, Afghanistan – The death toll in Afghanistan's deadliest insurgent attack this year has risen to at least 50, with 63 wounded, many of them children, officials said on Monday, as NATO confirmed that two of its service members were killed in an insurgent attack.

The nationality of the NATO soldiers could not be confirmed, according to protocol. The deaths bring the total for this month of foreign service members killed in Afghanistan to three. The total number killed this year is 63, 46 of them Americans.